/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.dxf2.metadata.objectbundle.hooks;

import java.util.List;
import java.util.Set;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import org.hisp.dhis.common.IdentifiableObject;
import org.hisp.dhis.dataelement.DataElement;
import org.hisp.dhis.dataelement.DataElementOperand;
import org.hisp.dhis.dataset.DataInputPeriod;
import org.hisp.dhis.dataset.DataSet;
import org.hisp.dhis.dataset.Section;
import org.hisp.dhis.dxf2.metadata.objectbundle.ObjectBundle;
import org.hisp.dhis.feedback.ErrorCode;
import org.hisp.dhis.feedback.ErrorReport;
import org.hisp.dhis.util.ObjectUtils;
import org.springframework.stereotype.Component;

/**
 * @author Viet Nguyen <viet@dhis2.org>
 */
@Component
public class DataSetObjectBundleHook extends AbstractObjectBundleHook<DataSet> {
  @Override
  public void validate(DataSet dataSet, ObjectBundle bundle, Consumer<ErrorReport> addReports) {
    Set<DataInputPeriod> inputPeriods = dataSet.getDataInputPeriods();

    for (DataInputPeriod period : inputPeriods) {
      if (ObjectUtils.allNonNull(period.getOpeningDate(), period.getClosingDate())
          && period.getOpeningDate().after(period.getClosingDate())) {
        addReports.accept(
            new ErrorReport(
                DataSet.class, ErrorCode.E4013, period.getClosingDate(), period.getOpeningDate()));
      }
    }
  }

  @Override
  public void preUpdate(DataSet object, DataSet persistedObject, ObjectBundle bundle) {
    if (object == null || !object.getClass().isAssignableFrom(DataSet.class)) return;

    deleteRemovedDataElementFromSection(persistedObject, object);
    deleteRemovedSection(persistedObject, object, bundle);
    deleteCompulsoryDataElementOperands(object);
  }

  /**
   * Remove the {@link DataSet#getCompulsoryDataElementOperands()} if the referenced {@link
   * DataElementOperand#getDataElement()} is being removed from DataSet.
   *
   * @param importDataSet the {@link DataSet} from import payload.
   */
  private void deleteCompulsoryDataElementOperands(DataSet importDataSet) {
    Set<String> dataElementIds =
        importDataSet.getDataElements().stream()
            .map(IdentifiableObject::getUid)
            .collect(Collectors.toSet());

    importDataSet.setCompulsoryDataElementOperands(
        importDataSet.getCompulsoryDataElementOperands().stream()
            .filter(dop -> dataElementIds.contains(dop.getDataElement().getUid()))
            .collect(Collectors.toSet()));
  }

  private void deleteRemovedSection(
      DataSet persistedDataSet, DataSet importDataSet, ObjectBundle bundle) {
    if (!bundle.isMetadataSyncImport()) return;

    List<String> importIds =
        importDataSet.getSections().stream()
            .map(IdentifiableObject::getUid)
            .collect(Collectors.toList());

    persistedDataSet.getSections().stream()
        .filter(section -> !importIds.contains(section.getUid()))
        .forEach(getSession()::delete);
  }

  private void deleteRemovedDataElementFromSection(
      DataSet persistedDataSet, DataSet importDataSet) {

    persistedDataSet.getSections().stream()
        .peek(section -> section.setDataElements(getUpdatedDataElements(importDataSet, section)))
        .forEach(getSession()::update);
  }

  private List<DataElement> getUpdatedDataElements(DataSet importDataSet, Section section) {
    return section.getDataElements().stream()
        .filter(
            de -> {
              Set<String> dataElements =
                  importDataSet.getDataElements().stream()
                      .map(IdentifiableObject::getUid)
                      .collect(Collectors.toSet());
              return dataElements.contains(de.getUid());
            })
        .collect(Collectors.toList());
  }
}
